From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4890C27703; Sat, 25 Jul 2026 07:48:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784965689; cv=none; b=Kk4PfjMQNv83zS9ecW/yeMxua5Ip9IO50CqiS6AN8pZMZIFIBPHikotalk+I5BUWJfpUrW2pH1dE7Dy+zDtdRz4deU9bs40RzunCZpjSWOsgE0BJddozy4F4XeaZiD1dfLdN1q6em//u7WfCLCDqMtglxT41Up21pH33tnY1qIY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784965689; c=relaxed/simple; bh=QXkK/9Px96JKbHfq/UN3bBzmYtF2w6Ep+yDY5BATFc4=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=esf0Vr5jC7n6osRCqwPD0wqCveQwcgL80nYiJeDv4Y4c383UXeYxAHTx7B9qYYwwPAR/EaGkTSTF67cEz1Fch1cxTTb3dQQROCPnMMSz5093Fkn/9AivCefMCTbQD0pl2gj+pE1oPsclfsCgROZ/iCJx8lMUv/WOAdog5XwUsMo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=NHzOuIGo; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="NHzOuIGo" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=QXkK/9Px96JKbHfq/UN3bBzmYtF2w6Ep+yDY5BATFc4=; b=NHzOuIGof+pE+Q7lMzP4z9Uvaq W2Wx1WNA62tXxqzuUoLI5xA5nCsBqoryYhBDMwxMOIR0y9MuZYI6OVU79Cy998y5+9Z6NITu0+5wm MoI0vCH4FwMy6zpPkKRNdxIGZWlfVge2jQheGsHd3bExYuXpcFWhyY7yC+Ez7YJPU2sVU9xqBM9fh t+zm7rwNdTDfkxu6HeoRTdDQCL8K0Mdqi2G1xJ4Ei06pbyxuMED9g77+4G1lLnRA32pkIi9WrpJa4 HwrX7ouoH3cwxSLjsoFRi6Sg/scaMOAsDTRuIazlNHo3xMoepMK6gq426Zh3QKhCCpwl2YrftYkds Kb/wH3ew==; Received: from [2001:8b0:10b:5:5b17:8d34:712e:739e] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wnX6j-00000005lYS-2DkA; Sat, 25 Jul 2026 07:47:41 +0000 Message-ID: Subject: Re: [PATCH v6 05/36] KVM: x86: Add KVM_[GS]ET_CLOCK_GUEST for accurate KVM clock migration From: David Woodhouse To: Sean Christopherson Cc: Paolo Bonzini , Jonathan Corbet , Shuah Khan , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Vitaly Kuznetsov , Juergen Gross , Boris Ostrovsky , Paul Durrant , Jonathan Cameron , Sascha Bischoff , Marc Zyngier , Joey Gouly , Jack Allister , Dongli Zhang , joe.jin@oracle.com, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org, linux-kselftest@vger.kernel.org Date: Sat, 25 Jul 2026 08:47:40 +0100 In-Reply-To: References: <20260703212145.343527-1-dwmw2@infradead.org> <20260703212145.343527-6-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-rBtXsowMEivQPp4CPNL1" User-Agent: Evolution 3.60.3-0ubuntu1~ppa9~24.04 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-rBtXsowMEivQPp4CPNL1 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2026-07-24 at 14:17 -0700, Sean Christopherson wrote: > On Fri, Jul 03, 2026, David Woodhouse wrote: > > From: Jack Allister > >=20 > > In the common case (where kvm->arch.use_master_clock is true), the KVM > > clock is defined as a simple arithmetic function of the guest TSC, base= d > > on a reference point stored in kvm->arch.master_kernel_ns and > > kvm->arch.master_cycle_now. > >=20 > > The existing KVM_[GS]ET_CLOCK functionality does not allow for this > > relationship to be precisely saved and restored by userspace. All it ca= n > > currently do is set the KVM clock at a given UTC reference time, which > > is necessarily imprecise. > >=20 > > So on live update, the guest TSC can remain cycle accurate at precisely > > the same offset from the host TSC, but there is no way for userspace to > > restore the KVM clock accurately. > >=20 > > Even on live migration to a new host, where the accuracy of the guest > > time-keeping is fundamentally limited by the accuracy of wallclock > > synchronization between the source and destination hosts, the clock jum= p > > experienced by the guest's TSC and its KVM clock should at least be > > *consistent*. Even when the guest TSC suffers a discontinuity, its KVM > > clock should still remain the *same* arithmetic function of the guest > > TSC, and not suffer an *additional* discontinuity. > >=20 > > To allow for accurate migration of the KVM clock, add per-vCPU ioctls > > which save and restore the actual PV clock info in > > pvclock_vcpu_time_info. > >=20 > > The restoration in KVM_SET_CLOCK_GUEST works by creating a new referenc= e > > point in time just as kvm_update_masterclock() does, and calculating th= e > > corresponding guest TSC value. This guest TSC value is then passed > > through the user-provided pvclock structure to generate the *intended* > > KVM clock value at that point in time, and through the *actual* KVM > > clock calculation. Then kvm->arch.kvmclock_offset is adjusted to > > eliminate the difference. > >=20 > > Where kvm->arch.use_master_clock is false (because the host TSC is > > unreliable, or the guest TSCs are configured strangely), the KVM clock > > is *not* defined as a function of the guest TSC so KVM_GET_CLOCK_GUEST > > returns an error. In this case, as documented, userspace shall use the > > legacy KVM_GET_CLOCK ioctl. The loss of precision is acceptable in this > > case since the clocks are imprecise in this mode anyway. > >=20 > > On *restoration*, if kvm->arch.use_master_clock is false, an error is > > returned for similar reasons and userspace shall fall back to using > > KVM_SET_CLOCK. This does mean that, as documented, userspace needs to > > use *both* KVM_GET_CLOCK_GUEST and KVM_GET_CLOCK and send both results > > with the migration data (unless the intent is to refuse to resume on a > > host with bad TSC). >=20 > Please post this as a standalone mini-series.=C2=A0 AFAICT, the only depe= ndency of > any kind is a minor conflict with the s/hw_tsc_khz/hw_tsc_hz change, and = that's > trivial to sort out later on. Hm? The calculations in kvm_vcpu_ioctl_set_clock_guest() are all Hz- based, not kHz. This *was* the start of the series (Jack posted it on its own in 2024), and I thought I'd moved the khz/hz thing to live before it on purpose? The kvm_xen_shared_info_init() one could be later, I guess. But is also trivial (and its commit message sets the stage for a bunch of the cleanups by analysing the various *different* ways that kvmclock gets derived).=20 I confess I'm not stunningly keen on breaking the series up. How about we just do it in stages? Merge patch 1 as it's fairly trivial, and then I can use its commit ID when I refer to its taxonomy later. Then we can do patches 2-6 which are the KVM_[GS]ET_CLOCK_GUEST support. And I can repost the remainder on top of that? > > +4.145 KVM_GET_CLOCK_GUEST > > +---------------------------- > > + > > +:Capability: none >=20 > Why not add a CAP?=C2=A0 The check in the subsequent selftest is quite gr= oss. Because nobody would ever use it in practice anyway. Even if the ioctl is present, you *still* have to try it and fall back to the old method because there are ways that a *guest* can force master clock mode off. --=-rBtXsowMEivQPp4CPNL1 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBHMjAeFw0yNDAzMTMwMDAwMDBaFw0zNDAz MTIyMzU5NTlaMGIxCzAJBgNVBAYTAlVTMRcwFQYDVQQKEw5EaWdpQ2VydCwgSW5jLjE6MDgGA1UE AxMxRGlnaUNlcnQgQXNzdXJlZCBHMiBTTUlNRSBSU0E0MDk2IFNIQTM4NCAyMDI0IENBMTCCAiIw DQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAOfSIeC0vv1xPQ+dgSxbIIrkaru6skAWJYaGFzmv q4Kq+2wU2jxhcWlJg/JeP5jEkq/LM3pn5aaLao79j+XRmS7J1ZpJKUODJVoM4s9MQJhTMvo4qS5Z 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